ARP 2600 - Noise Generator Input to the Filter; Filter Investigation with Noise and VCO2

54
ion
Sine
Triangle Sawtooth
Square Pulse
When
you
are familiar
with
all
five
of the oscillator
output
waveforms,
close
ail the
filter
inputs,
and
remove
the
patchcord
you
were
using.
Now
open
the
input to
the
filter
from
the
out
5.106
Noise
Generator
;
this is
the
last
of the
five
Filter
inputs. The
Noise Generator is
the
fourth signal generator
in
the
2600,
and the
only
one
that generates
non-periodic output voltages. Familiarize
yourself with
its
controls;
the
level
control has a
perfectly
obvious
func-
tion,
and so,
audibly, does
the color control at its
left.
We
have
provided
detailed
information on
the noise generator
in
section
4
and will not
repeat it here.
Our
main
reason
for
introducing
it
here
is—
aside from
simply physically getting
you
acquainted
with
its
two
control sliders—
simply
to
provide a
logical
sound source through
which to
Introduce
you
to the
operation and
control of
5.107 The
Voltage
Controlled
Filter
.
Begin
your
investigation with
the
NG-Filter
input
perhaps
not quite
wide
open—
nine-tenths
of
maxi-
mum—the noise
generator
level
control about
two-thirds up,
and
the
color
control
set for
pink
noise. Fitter
resonance at minimum and
initial
frequency
at maximum.